this all began after midnight when ross police made a dui stop on the man's car near sir francis drake and college. but during the field sobriety test, this man took off running from officers. officers watched him go in the creek and eventually lost sight of him. >> they followed for about 100 yards trying to encourage the person to come out of the swift water. he swam away from the officers. the officers followed him as far as they could until they couldn't anymore. >> reporter: now, the ross police chief said he isn't going to release the name of the missing man at this point but police are very concerned about his well being since the water is cold and the current, especially in the air area where he went in, is -- in the area where he went in, is swift. it's possible a dive team could be called in to search for him. but we understand the search- and-rescue team will pick up the search at 7:00, the chief said. we have not seen them yet. we'll monitor the situation. we're live in green brain -- greenbrae this morning, alex savidge, ktvu channel 2 news. >> thank you, alex. >>> rising